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ID:46293103
大小:2.72 MB
页数:7页
时间:2019-11-22
《基于弛豫电量的变压器油纸绝缘老化评估》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第38卷第5期仪器仪表学报Vol38No52017年5月ChineseJournalofScientificInstrumentMay.2017基于弛豫电量的变压器油纸绝缘老化评估112贺德华,蔡金锭,蔡嘉(1.福州大学电气工程与自动化学院福州350108;2.国网福建省电力有限公司物资分公司福州350003)摘要:回复电压法是一种研究电力变压器绝缘老化状态的无损检测方法。回复电压含有丰富的反映绝缘状态的介电弛豫响应信息,为充分发挥回复电压法诊断油纸绝缘老化的优点,提出了利用驰豫电量评估变压
2、器绝缘老化状态的新方法,并给出了相对驰豫电量与变压器油中糠醛含量的定量关系。首先,对回复电压曲线进行微分解谱求解回复电压的驰豫响应函数;其次,利用驰豫电量与驰豫响应函数的关系,计算出回复电压测量过程中的相对驰豫电量;最后,分析了相对驰豫电量与绝缘老化状态的关系。分析结果表明,驰豫电量对变压器油纸绝缘的老化非常敏感,相对驰豫电量Q1000和Q500与变压器油中糠醛含量存在较好的线性关系,相对驰豫电量可用于变压器油纸绝缘老化的定量评估。关键词:回复电压;驰豫响应;时域微分解谱;驰豫电荷;绝缘诊断中图分
3、类号:TH183TM411文献标识码:A国家标准学科分类代码:470.40Agingevaluationoftransformeroilpaperinsulationbasedonquantityofrelaxationcharge112HeDehua,CaiJinding,CaiJia(1.CollegeofElectricalEngineeringandAutomation,FuzhouUniversity,Fuzhou350108,China;2.MaterialsBranch,State
4、GridFujianElectricPowerCompanyLtd.,Fuzhou350003,China)Abstract:Returnvoltagemethodisanondestructivetestingtechniqueforstudyingtheinsulationagingstateofpowertransformer.Thereturnvoltagecontainsabundantinformationaboutdielectricrelaxationresponsereflect
5、ingtheinsulationagingstatusoftransformer.Inordertogivefullplaytotheadvantagesofreturnvoltagemethodindiagnosingtransformeroilpaperinsulationaging,anewmethodisproposed,whichevaluatestheinsulationagingstateoftransformerusingthequantityofrelaxationcharge.
6、Thequantitativerelationshipbetweentherelativequantityofrelaxationchargeandthefurfuralcontentinthetransformeroilisgiven.Firstofall,thereturnvoltagecurveisprocessedwiththetimedifferentialunfoldingandtherelaxationresponsefunctionofthereturnvoltageissolv
7、ed.Secondly,therelativequantityofrelaxationchargeinthemeasurementprocessofreturnvoltageiscalculatedusingtherelationshipbetweenthequantityofrelaxationchargeandtherelaxationresponsefunction.Finally,therelationshipbetweentherelativequantityofrelaxationch
8、argeandinsulationagingstateisanalyzed.Analysisresultsshowthatthequantityofrelaxationchargeisverysensitivetotheagingoftransformeroilpaperinsulation.ThereisagoodlinearrelationshipbetweenfurfuralcontentandtherelativequantitiesofrelaxationchargeQ1
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